Re: [PATCH 11/14] x86: Populate cpu_enabled_map

From: H. Peter Anvin
Date: Fri Jul 18 2008 - 16:01:14 EST

Alex Chiang wrote:
Populate the cpu_enabled_map correctly.

Note that this patch does not actually make any decisions based
on the contents of the map.

However, as the map is presented via sysfs in:


It should be populated correctly.

There will be a user-visible change under the above directory.
cpuN/ entries for firmware-disabled CPUs will now appear, whereas
before, they did not due to a check against ACPI_MADT_ENABLED.

The cpuN/ entries will be empty, and the online file in the
above directory will reflect which CPUs are actually schedulable.

Signed-off-by: Alex Chiang <achiang@xxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>

From an x86 standpoint this patchset seems reasonable to me.

Acked-by: H. Peter Anvin <hpa@xxxxxxxxx>

Since it is a panarch patchset it presumably should go via -mm rather than in the arch trees, so I'm not going to add it to -tip.

Obviously, if the sematics of the operations don't make sense for other architectures -- which I will leave up to the affected maintainers -- then that should be carefully considered if the generic operations can be done better.

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